§108.175. Contiguous locations.

46 C.F.R. § 108.175

An enclosed space that has direct access to a Division 1 or Division 2 location is the same division as that location, except—

(a)

An enclosed space that has direct access to a Division 1 location is not a hazardous location if—

(1)

The access has self-closing gas-tight doors that form an air lock;

(2)

The ventilation causes greater pressure in the space than in the Division 1 location; and

(3)

Loss of ventilation overpressure activates an alarm at a manned station;

(b)

An enclosed space that has direct access to a Division 1 location can be considered as a Division 2 location if—

(1)

The access has a self-closing, gas-tight door that opens into the space and that has no hold-back device;

(2)

Ventilation causes the air to flow with the door open from the space into the Division 1 location; and

(3)

Loss of ventilation activates an alarm at a manned control station; and

(c)

An enclosed space that has direct access to a Division 2 location is not a hazardous location if—

(1)

The access has a self-closing, gas-tight door that opens into the space and that has no hold-back device;

(2)

Ventilation causes the air to flow with the door open from the space into the Division 2 location; and

(3)

Loss of ventilation activates an alarm at a manned control station.

Notes, amendments, and revision history

Authority: 43 U.S.C. 1333; 46 U.S.C. 3102, 3306; DHS Delegation No. 00170.1, Revision No. 01.4.

Source: CGD 73-251, 43 FR 56808, Dec. 4, 1978, unless otherwise noted.